Railway-traffic-governing apparatus



March 15,1927.

' D. W. RICHARDS -ET AL RAILWAY TRAFFIC GOVERNING APPARATUS Filed A fil25, 1922 4 Sheets-Sheet 1 INVENTORSI Z3. W. Rial/ward? m -QP. Hqmw ak,

{1% ATTORNEY 1,62 0 March D.'W. RICHARDS ET AL 069 RAILWAY TRAFFIC GOVERNING APPARATUS Filed April 25. 1922 4 Sheets-Sheet 2 m 22 N k INVENTOR5 I D. W. R/bh arms a Q.- z'zfiw ATTORNEY March 15,1927, 90

D. w. RICHARDS ET AL,

RAILWAY TRAFFIC GOVERNING APPARATUS Filed April 25. I922 4 Sheets-Sheet5 INYENTORS D. W R/chdrds 4 74 H.Y/ Hqncaak,

UM" ATTORNEY 1,620,690 March 1927 D. w. RICHARDS ET AL RAILWAY TRAFFICGOVERNING APPARATUS Filed April 25. 1922 4 Sheets-Sheet 4 we r 00 m.-gfig g 104 wm 4 Fly 9 W INVENTOR s:

D-W- l hqrds '0 163 Hanan ck,

'V'm ATTORNEY Patented Mar. 15, 1927.

UNITED STATES PATENT OFFIE.

DANIEL W. RICHARDS AND HARRY P. HANCOCK, OF ROANOKE, VIRGINIA.

RAILWAY-TRAFFIO-GOVERNING APPARATUS.

Application filcd April 25, 1922. Serial No. 556,506.

()ur invention relates to railway tratiic governing apparatus, and hasfor an object the provision of means For controlling tratlic governingdevices. such as railway signals. 5 from a distant POllltSllt'lltlS adcspatchers oliice. Another object of our invention is the provision ofmeans for enabling a train despatcher or other otiicial to beinformedwhen a signal at a distant point changes 10 from one indication toanother, thereby enabling him to locate a train.

\Ve will describe one form of apparatus embodying our invention and willthen point out the novel features thereof in claims.

In the accompanying drawings, Figs. 1 and 1 are diagrammatic views whichwhen placed end to end in the order named. illustrate one form ofcontrolling and indicating apparatus embodying our inven- 29 tion, andwhich views will hereinafter be referred to collectively as Fig. 1. Fig.'2 is a view showing in side elevation one form of device which maybeattached to the semaphore signals shown in Fig. 1 for transmitting animpulse combination and forgoverning onc or more circuits. Fig. 3 is' atop plan view of the device shown in Fig. 2.

Fig. 4 is a perspective View of .the code wheel forming part of thedevice shown in Figs. 2 and Fig. 5 is a sectional view on the line. V ofFig. 3 looking in the direction indicated by the arrow. Fig. (3 is aView similar to Fig. 5 but showing a modified arrangement ot' gearingfor :ausing re ieatcd operations 01'. the code wheel instead of a singleoperation' Fig. 7 is a plan view showing one form of thermal circuitcontroller which may be used in connection with the apparatus shown inFig. 1. Fig. 8 is a side elevation of the control'er shown in Fig.

7. and Fig. 9 is a sectional view on the line l X-1XJ ot Fig. 8 lookingin the direction indicated by the arrow.

'Similar re iercnce characters refer to similar parts in each of theseveral views.

Referring first to Fig. the reference characters 22 and .22 designatethev track rails of a railway along which traffic normal ly moves in thedirection indicated by the arrows. 'lrafiic moving insuch directiongoverned by a seriesotsignals S. S" and S, which are located at.suitab'e intervals .a nd are controlled in theusual and well ltuownmanner hvineans of track circuits.

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.known commercial devices.

These track circuits are provided as usual by dividing the track railsby insulated joints 23 into a series of electrically isolated sectionsV-W, W-X, X-Y, etc., and the track circuit for each section comprisesthe truck rails of the section, a source of current 6, which as hereshown is a battery, and a track relay designated by the reference.character T wit-h a suitab'e exponent. The controlling circuits for thesignals will be explained hereinafter in discussing the operation of thesystem as a whole, it being sutlicient to point out at. the present timethat each signal is controlled automatically by the track relays in suchmanner that the signal indicates Stop when the corresponding tracksection is occupied, Caution when the corresponding section isunoccupied and the section next in advance is occupied, and Proceed whenthe corresponding section and the section next in advance arebothunoccupied.

In accordance with our invention these signals contro'led in part from acentral location 5, which is usually the office of a train despatcher orother proper otticial. This control is atllected by selectors associatedwith each signal. together with means in the despatchers office fortransmitting impulse combinations to which such selectors areresponsive. These selectors may be Gill selectors, Model 1333. whichselectors are well In addition to this. the despatchers otlice isprovided with selectors and the signals are provided with apparatus fortransmitting impulse coinbinations to the last-mentioned selectors,-thereby giving the despat cher information concerning the'condition oroperation of the Jsignals.

In order to illustrate the operation of the. apparatus. we will assume.that the despat'cher desires to be informed as to the indication givenby signal S for ,the purpose of locating a train in the section governedby this signal and for which reason he also desires to determine whenthis signhl moves to the stop -iosition. To do this he operates code he-.-\-in the de i nitchefs oifice Z,'thercb causing operation of atelcgraph relay 24 through a circuit whichincludes a battery and thecontact 36 of the key A. 'lhe operation of relay 24: causes thetransmission of an impulse combination from qucnt closing of contact 8of this selector closes a circuit for relay M, which circuit passes frombattery 16, through wires 79, 81, 82, and 83, contact 8, right-handwinding 84 of selector F wire 85, winding of relay M wires 86, 87, and88, manually operable key 17, and wire 89 to battery 16. The closing ofrelay M closes at contact 22 a circuit 'for a lamp L which circuitpasses from the secondary of a transformer U, through wire 90, lamp Lwire 91, contact "22, and wire 02 to the secondary o't' transformer U.The primary of transformer U is connected with an alternating currenttransmission line 02), which in practice will usually be an electriclighting line. The lighting of lamp it illdicates to the despatcher thata train has passed signal S y The momentary opening-of contact lgustbefore signal s reaches the stop position .opens the holding circuit forrelay 1), so

that this relay becomes dc-energized. The parts of the apparatus arethen restored to the conditions in which they are shown n the drawing.

We will now assume that signal S is in the proceed or caution position,and that the despatcherdesires to place this signal at stop. Toaccomplish this the despatcher first operates. his code key A, therebycans ing relay D to close as before. He then operates his code key G,which key transmits the impulse combination to which selector H insignal S responds. While contact of this selector is closed, a repeatingrelay J is energized by virtue of a circuit which passes from battery12, through wires 39 and 94,

contact 9, winding 95, wires 96 and 97, relay J, wires 98, 45 and 46, tobattery 12. The closing of contact 10 of relay J closes a pick-upcircuit for a stick relay K, which circuit passes from battery 11,through wires 47, 48, 55, 58 and 100, contact 10 of relay J, Wire 101-,contact 13 of relay D, wire 102, winding of relay K, and wires 103, 53and 51 to battery 11. As soon as relay K closes, a stick circuit forthis relay becomes closed, which circuit passes from battery 11, throughwires 47, 48, 55, and 107, back con-' tact 14 of relay 0, wire 108,contact 109 of relay K, wire 110, winding of relay K, and

I wires 103, 53 and 54 to battery 11. Theclosing of relay K opens atback contact 15 the caution indication ircuit for signal 8, whichcircuit is from battery 11, through wires 17 and 111, back contact 15,wire 1.12; contact 113 of track relay T wire 114, operating mechanism ofsignal S", and wires 115 and 54 to battery 11. Signal S" then moves tothe stop position. \Vhen a train reaches signal S it will, of course,come to a stop and the train crew can then communicate with thedespatchcr by means of a telephone N which is located adjacent signal Sand is connected across the line Bil-29. Haringplaced signal S" in thestop position the despatcher "an restore it to caution or proceedposition by operating code key A, thereby actuating selector B, which inturn energizes relay t. The open ing of back Contact 14 of relay opensthe stick circuit for relay li. so that the caution "indication circuitfor signal S" is again closed at contact 15, whereupon the signalreturns to the caution or pl'occcal position, provided that'trafi iccondition:-: In advance of this signal are, such as to pcrmit the signal7 of selectorH, windinpof this selector.

wires 96 and 172, contact 173 of relay K, wire 17-1, contact (35, wire(36, bell E, and wires 67, 75 and 4G to battery 12. The intermittentcurrent in this circuit due to hell E will cause impulses to be inducedin line wires 28 and 29 by virtue of transformer action in selector H,and so the despatcher will know by the sound in his telephone N that thesignal is at stop. By this means the despatchcr is informed that theblock controlled by signal S is occupied, and so he is enabled by trialto locate a train. The annunciation may be discontinued as before byoperating key B.

One important feature of the apparatus is that, eventhough a signal isat stop owing to the presence of a train, the signalmav be held in thisposition to stop a following: train, this being accomplished by thenecc; sary steps on the part of the dcspatchcr to close relay K. Thedcspatcher can subscquently place the signal in condition to clear whenthe block becomes unoccupied. this be ing done as before by causingrelay K to; open.

Although we lnnc l|()\\'ll only two i'hill keys A and (1" in thedcspatchcrs oliicc 71, it is understood that a similar pair of keys willbe provided for each signal which is controlled from this oflice. Thatis to say, a similar pair of keys will he provided for the operation ofselectors B and H at signal S, and a third pair of keys will be providcdfor the operation of selectors ll and H at signal S.

\Ve will now assume that the (l0::])zll(ll0l' desires to trace themovement of a train "com the time that it passes signal S to the time:that it. passes signal S. To do this he operates each of his indicationcode keys A, thereby closing contact 2 in the selector B at each signalS .S and S". This results in energizing relay D at each signal. "When atrain passes signal S the consequent movement of this signal to the stopposition transmits an impulse combination over the line wires 28 and 29which actuates selector F in the dcspatchcrs oiiice. \Vhile contact 8 ofthis selector is closed. a pick-up circuit for relay M is closed, whichcircuit passes from battery 16, through wires 79, 81, 82,

19 115) and 120. contact 8 of selector F winding 121 of this selector,wire 122, winding of relay M, wires 123 and 88, key 17, and wire 8!) tobattery 16. As soon as relay M closes, a stick circuit for this relaybecomes closed, which circuit passes from battery 16, through wires 79,t2 and 125, back contact 18 of relay M, wire 126, contact 127 of relayM, wire 128, winding of relay M wires 123 and 88, key 17. and wire 89 tobattery 16.

20 The closing of relay M closes a circuit for lamp L. which circuitpasses from transformer U, through wire 90, lamp L wire 1525), contact.15) of relay M and wires- 13d and 92 to-transiormer l7. When the trainpasses signal S it sends an impulse combination over the line wires .28and 2-9 which causes operation of the selector F in the despatchersofi'ice. \Vhile contact 8 of this selector is closed. relay M isenergized by a circuit which passes from battery 16; through wires 79,8-1, 82 and 119, contact 8 of selector F winding 131 of this selector.wire 132, winding of relay M wires 87 and soon as relay M" closes, astick circuit for this relay is closed, which circuit .passes frombattery 16, through wires 79 and 81, back point of contact 20 of relay Mwire 133, contact 13 1 of relay M wire 135, winding of relay M thenthrough 87, 88. 17 and i 89 to battery 16. Contact 21 of relay M closesa circuit for lamp L, which circuit is from transformer U, through wire90, lamp L, wire 136, contact 21 of relay M and wires 137 and 92 totransformer U. When relay M closes, the stick circuit for relay M isopened at back contact 18. so that the latter relay becomesrte-energized and lamp L becomes extinguished. 'hen the train passessignal S relay M becomes energized, as explained hercinbcfore, therebycausing lamp L to become lighted. Relay M remains closed until thedespatcher closes his key R or another calling key has been operated.The closing of relay M also opens at the back point of contact 20 thestick circuit for relay M" so that lamp L becomes extinguished.

Assuming that relay M has been energized by a train passing signal St,the despatcher can dcenergize this relay at will by opening key 17,thereby opening the holding circuit for relay M. Relays M and M can betie-energized at will in th same manner.

88, key 1.7, and wire 89 to battery 16. As'

The function of the thermal circuit controller Q, is as follows: As willbe apparent from Fig. 1-, each time that the telegrapl'i relay 7 of. thetransmitting device P is closed, it causes a momentary connection acrossthe line wires 28 and 29 through battery 7 6 and contact 117 of relay D.If the code wheel contact 169 or the'telegraph line relay 7 should stickin the closed position, this short circuit would. tie up the apparatusin so far as concerns the control of the signals from the despatehersotiice and the indication of signal operation in the despatchers otiice.To avoid this difficulty we have provided the thermal circuit controllerQ. The normally closed contact 5, as pointed out hereinbefore, isincluded in the holding circuit for the indication stick relay D. Thecircuit for the winding of the device Q is from a battery 138, throughwire 139, contact 140 of relay D wire 141, winding 142 of circuitcontroller Q, wire 143, contact 144 oi telegraph relay 7, and wire 145to battery 138. During the normal operation of the transmitting device Pcontact 1 1 1 is closed intermittently for short intervals, but theseintervals are .not sullicient to heat the device Q, to such point thatcontact 5 will open. It. however, contact 169 or the telegraph relay 7should stick in the closed position, contact 144 will remain closed, andafter a given in terval of time circuit controller Q will become heatedto a sufficient degree to open contact 5 This will open relay .1) and sowill disconnectthe transmitting apparatus P from line wire 28. The restof the apparatus will then function in the proper manner, but thetransmitting device P will. of course, remain out of commission untilthe difiiculty is removed.

Referring now to Figs. 2, 3, at and 5, we have here shown one form ofapparatus which may be applied to each signalS to control the associatedcode wheel (3 and contact at. This apparatus comprises a? shaftlli'which is biased by a coiled spring 14% to occupythe position inwhichit is shown in Fig. 2, but which is provided with an arm 1&5) whereby itmhe turned in clockwise direction in oppos tion to the force exerted bythe spring. The arm 149 co-operates with a rod 150 which is connectedwith the Semaphore' 151 of signal S andWv-hich is constrained to'move ina substantially vertical direction. The co-action 0t rod 150 and arm 119 is as follows: YVhen the signal is at stop the arm is substantiallyhorizontal'with the upper end of the rod directly underthe arm; when thesignal moves to the caution position the rod swings the arm and shaft inclockwise direction through substantially and as. the signal continuesto the proceed position the rod merely slides past'the arm withoutcausing any further movement of the latter. Vthen the signal returns to.

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the caution position it of course has no effect on the arm i l-landshaft 147, but. when the signal returns. to the stop position theseparts are restored to their normal position by spring 14-6.

Attached. to the inner end of shaft 147 is aratch'et 152 whichco-operates with a pawl 153011 'a {rear wheel 15% which gear wheel isotherwise free'to rotate with respect to the shaft. 'The arrangement ofthe pawl and ratchet is such that when the shaft is swungin clockwisedirection by the signal, the gear wheel does not revolve, but that thisgear wheel is positively connected with the shaft when the latterreturns under the influence of spring 148. Meshing with gear wheel 154is a small gear 155 fixed to a shaft 156 which carries the code wheel 6.The ratio of these two gears is such that the code wheel makes onecomplete revolution while the shaft 14'? i is making its usual 90movement from they vertical to the horizontal position of arm 149. Thecode wheel co-operates with the contact 169 in the usual and well knownmanner, so

' that this contact is closed by eachtooth on.

the wheel.

The speed of operation of the code wheel by spring 148 is limited by acentrifugal speed governor 159 which is operatively connected with codewheel shaft 156 through the medium of gears 160.

In order-to stop the code wheel 6 at the proper place, the shaft 147carries a Z shaped pawl 161 which co-operates with a pin 162 fixed inthe code wheel. WVhen the shaft is swung in clockwise direction by thesignal, the pawl moves downwardly out of. the path of the pin, so thatthe code wheel can revolve when the parts. are released, but.

as the shaft approaches its normal or biased position this pawl returnsto its position in the path of the pin and so arrests the moving partsjust as the operation of the code wheel is completed.

The auxiliary contact 4 is normally closed, but is momentarily opened bythe pin 162 on code wheel 6 just before this wheel comes to rest, thatis, when the signal has reached the stop position. I

As shown in Fi g. 5 the code wheel 6 makes only one revolution while thesignal is movin from the caution to the stop position.

but if desired the code wheel may be caused to make two or morerevolutions during such movement of the signal, so that the impulsecombination transmitted bythis wheel will be impressed on the line twoor more times in succession, thereby increasing the probability of thesuccessful response of the corrc sponding selector in the despatchersoiiice. This may be accomplished by adding a gear wheel 1700and pinion171 between wheel 154 and pinion' 155 as shown in Fig. 6.

Referring-now to Figs. 7, 8 and 9, we have here illustrated one form ofthemal. circuit to binding posts 166 and 166*.

The terminals of this winding are attached Also mounted on the base 163is a yoke 167 carrying an adjustable screw 168 which, with the element16%, constitutes the contact 5 of the circuit controller. Atnormaltemperature this contact is closed, but when the element 16% isheated due to prolonged supply of current to winding 165, this elementbends downwardly out of engagement with the screw 168 so that contact 5is then open,

Although wehave herein shown and described only one system embodying ourinvention, and only a few forms of apparatus for use in such system, itis understood that various changes and modifications may be -madetherein within the scope of the appended claims without departing fromthe spirit and scope of our invention.

Having thus described our invention, what we claimis:

1. In combination. a series of railway' contact which is closed when theoperating 1 winding receives the impulse combination to which theselector responds; a circuit including said contact and said auxiliarywinding and a repeater relay, a stickrelay, a pick-up circuit for saidstick relay controlled by said repeater relay, a holding circuit forsaid stick relay controlled by a contact operated by said signal, anindicat ing device. and a circuit for said device controlled by saidsignal and by said stick relay and by said selector contact.

3. In combination, a railway'signal, two selectors associated therewithand selectively responsive to two different impulse combinations, moanscontrolled by said selectors for placing said signal at stop or proceed.and means including two code keys under the control of a despatcher at adistant point for transmitting saidtwo impulse combina tions to saidselectors.-

4. In combination, a railway signal, a stick relay, means controlled bysaid relay when energized for causing a change in the indication givenby said signal, means includinga selector at the signal and a code keyat a distantv point for closing said relay, and means for subsequentlykeeping said relay closed until the change of indication of said signalhas been accomplished.

5. In combination, a railway signal, a stick relay, means controlled bysaid relay when energized for causing a change in @the indication givenby said signal, means ill eluding a selector ah the signal and a codekey at a distant point for closing said relay, means for subseuentlykeeping said relay closed until the c ange indication of saidsignal has been accomplished, and means controlled by said relay whenclosed for giving positive information at said distant, point of theindication given by said signal.

6. In combination, a railway signal, a code key associated therewith,means responsive to a change in the indication given by said signal forcausing operation oi said code key, a selector located at a distantpoint and responsive to the impulse combination transmitted by said codekey. and indicating means controlled by said selector.

7. In combination, a railway signal, a stick relay associated therewith,means in: eluding a selector at the signal and a code key at a distantpoint for closing said relay,

' means for subsequently keeping said relay closed until said signalchangesto the stop indication, and means controlled by said relay whenclosed for giving a. positive indication at said distant point if saidsignal is giving a proceed indication.

8. In combination, a railway signal, a s ck relay associated therewith,means inc. cling a selector at the signal and acode key eta distantpoint for closing said relay,

means for subsequently keeping said relay closed until said signalchanges to the stop indication, and means controlled ointly by saidrelay and by said selector and effective while the relay is closed andthe selector has responded to operation of said code key. to give apositive indication at said distant point if said signal is in a proceedcondition 9. In combination, a railway signal, a stick relay associatedtherewith, means including" a selector at the signal and a code key at adistant point for closing said relay, means for subsequently keepingsaid relay closed until said signal changes to the stop ind cation, andmeans effective if said relay is closed to give an indication at saiddistant point when said signal changes to the stop condition.

10. In combination, a railway signal. a stick relay associatedtherewith, means including a selector at the signal and a code key at adistant point for closng said relay, means for subsequently keeping saidrelay closed pntil said signal changes to the stop indication, and meansincluding a vibrating device at said signal and a telephone receiver atSaid distant point and operating eeoneo when said relay is closed togive a positive indication, a vibrating device adjacent said signal,means for operating said device when said relay is closed and the signalis at proceed, and means including a telephone receiver at said distantpoint for detecting operation of said device.

12. In combination, a railway signal, a slick relay associatedtherewith, means including a selector at the signal and a code key at adistant point for closing said relay, means for subsequently keepingsaid relay closed until said signal changes to the stop indication, avibrating device adjacent said signal, means for operating said deviceafter said relay closes and said selector has re sponded to its code keyprovided said signal is at proceed, and means for detecting operation ofsaid vibrating device at said distant point.

13. In combination, a railway signal, a stick relay associatedtherewith, means including a selector at the signal and a code key at adistantpoint for closing said relay, means for subsequently keeping saidrelay closed until said signal changes to the stop indicatiomand meansincluding a code key operated by said signal and a selector at saiddistant point for indicating when said signal changes to the stop condtion if said relay is closed at such time.

l t'ln combination, a railway signal, a. stick relay associatedtherewith, means in cluding a selector at the signal and a code key at adistant point for closing said relay, means for subsequently keepingsaid relay closed until said signal changes to the stop indication. aselector at said distant point, means including a. code key actuated bysaid signal and operating when the signal moves to the stop position ifsaid relay is closed to transmit to said second selector the impulsecombiuation to which it responds. and indicating means controlled bysaid second selector.

15. In combination, a-railway signal, a stick relay associal'hdtherewith, means including a selector atthe sgnal and a code key at adistant point fer closing said relay. means for subsequently keepingsaid relay closed until said signal changes to the stop indication, aselector at said distant point,

means including a code key actuated by said signal and operating Whenthe signal moves to the stop position if said relay is closed totransmit to said second selector the imnilse combination to which it resonds. a

lamp at said distant point, and means for lighting said lamp when theselector at said point receives the impulse combination to which itresponds.

lt iln combination. a railway signal. a selector associated therewith,and including a contact which becomes closed when the selector receivesthe impulsecombination to which it responds, means including a code keyat a distant point for transmitting said impulse=combination to saidselector. and. means controlled jointly by said selector and said signaland operating it the signal is at proceed while the selector contact isclosed to give a positive indicat'on at said distantpoint.

17. In combination. a railway signal. a selector associated therewith.and including a contact which becomes closed when the 'selector receivesthe impulse combination to which it responds, means including a code keyat a distant point for transn'iitting said impulse combination to saidselector. a vibrating device associated with said signal,

means for operating said device while said selector contact is closed itsaid signal then indicates proceed, and means including a telephonereceiver at said distantpo'nt fo detecting operation of said vibratingdevice.

18. In combination, a railway signal. a code key actuated by said signalfor transmitting an impulse combination. and indicating means for saidsignal including a selector at a distant point responsive to the impulsecombination transmitted by said code kev.

ill

, 19. In combination, a. railway signal. a code key actuated by saidsignal for transmitting an impulse combination, a selector located at adistant point and responsive to the impulse combination transmitted bysaid code key. a lamp 'atsaid distant point. and means for lighting saidlamp when said selector receives the impulsecombination to which itresponds.

20. In combination a railway signal. a code key actuated by'said signalfor transmitting an impulse combination. a selector located at a.distant point and responsive to the impulse combination transmitted bysaid.

code key. a lamp at said distant point. means for lighting said lampwhen said selector receives the impulse combination to which itresponds, means for subsequently keeping said lamp lighted. and manuallyoperable means for eiitinguishing said lamp.

21. In combination, a railway signal. a transmission line extending fromsaid signal to a distant. point, a code key actuated by said signal forimpressing an impulse'coinbination on said line. and indicating 'meansat said distant point including a selector connected with saidtransmission line and responsive to the impulse combination delivered bysaid code key.

22. In combination. a railway signal. a code key associated therewith,means responsive to a change in the indication given by said signal forcausing operation of said code key. a selector located at a. distantpoint and responsive to the impulse combination transmitted by said codekey. a lamp. and

means for lighting said lamp when said FC- lcctor receives the impulsecombination to which it responds.

23. In combination, a railway signal, two selectors associatedtherewith. and responsiv to two different impulse combinations meansincluding two code keys located at a distant point for transmitting saidimpulse combinations to said selectors. a relay, means for closing saidrelay when one selector responds to its impulse combination. means forsubscquently keeping said relay clo'ed, means for placing said signal atstop when said relay is closed. and means for opening said relay whenthe other selector responds to its impulse combination. i

In combination, a railway signal. two selectors associated therewith andresponsive to two difierent impulse combinations, means including twocode keys lo' ated at a distant point tor transn'iitting said impulsecombinations to said selectors. and means operating to place said signalat stop when said two selectors respond successively to their respectiveimpulse COIIlblIltltlOllS.

25. In combinatiom a railway signal. two selectors associated therewithand responsive to two difl'crcnt impulse combinations, means includingtwo code keys located at a distant point for transmitting said impulsecombi- 'nationsto said selectors. a repeating relay for each selector.means for closing each re-. peating relay when the correspondingselector responds to itsimpulse con'ibination, a stick relay for each re'ieating relay. a pick-up circuit for the ti st stick relay con trolledby a. frontnontact of the associated repeating relay, a holding circuitfor said first stick relay. a pick-up circuit for the second stick relaycontrolled by a trout eon tact of the associated repeating relay and afront contact of the first stick relay. a holding circuit for the secondstick relay controlled by a back contact of the first repeating relay,and an operatingcircuit 't'or said signal controlled by second stickrelay.

26. In combination. a railway signal. two selectors associated therewithand responsive to two ditiercnt impulse combinations. means includingtwo code keys located' at a distant. point for transmitting said impulsecomhh nations to said selectors. means operated by the successiveresponse of said two selectors, for placing said signal at stop. andmeans operated by the subsequent response of one of said selectors forrestoring said signal to proceed.

27. In combination. a railway signal, a code key associated therewith.means responlit),

lthl

Ian

said signal for causing operation of said code key, a selector locatedat a distant point and responsive to the impulse combination transmittedby said code key, a lamp, means for lighting said lamp when saidselector receives the impulse combination to which it responds, andmeans for subsequently keeping said lamp lighted.

28. In combination. a series of railway signals, a transmission lineextending from said signals to a distant point, a code key associatedwith each signal, for impressing a distinctive impulse combination onsaid transmission line, '11 series of selectors located at said .distantpoint and receiving impulses from said transmission line and eachselectively responsive to the' impulse combination of one of saidcodekeys, and indication means controlled by said selectors. 29. Incombination, a series of railway signals. apparatus foreach' signalincluding a code key operated by the signal for transmitting adistinctive impulse combination. a series of selectors, located at acentral point and responding to said distinctive impulse combinationsrespectively, and means controlled by sa d selectors for indicatingoperation of said signals.

30. In combination, a series of railway signals, apparatus for eachsignal including a code key operated by the signal for transmitting adistinctive impulse combination, a series of selectors located at acentral point and responding to said distinctive impulse combinationsrespectively, a relay associated with each selector, means controlled byeach selector when operated by its distinctive impulse combination forclosing the associated relay, and an indication device controlled byeach relay.

31. In combination, a series of railway signals. apparatus for eachsignal including a code key operated by the signal for transmitting adistinctive impulse combination, a series otselectors located at acentral point and responding to said distinctive impulse cinnl iinationsrespectively, a relay associated with each selector, a pick-up circuitfor each relay closed when the asso'ciated selectorresponds to itsdistinctive impulse combination. a holding circuit for each relay exceptthe last in the series controlled by a back contact of the next relay inthe series, and indication devices controlled by said relays.

32. In combination, a series of railway signals. apparatus for eachsignal including a code key operated by the signal for transmittin; adistinctive impulse combination, a series of selectors located at acentral point and responding to said distinctive i1npulse combinationsrespectively, a relay associated with each selector, a pick-up circuitfor each relay closed when the associated selector responds to itsdistinctive impulse combination, a holding circuit for each relay pointand responding to said distinctive im- 1 pulse combinationsrespectively, a relay as Sociated with each selector, means for closingeach relay when the associated selectoLresponds and for keeping itclosed until the next relay closes, and indication devices controlled bysaid relays.

In combination, a series of railway signals, apparatus for each signalincluding a code key operated by the signal for transmitting adistinctive impulse combination, a series of selectors located at acentral point and responding to said distinctive impulse combinationsrespectively, indication lamps associated with said selectors, and meansfor lighting each lamp upon the response of the associated selector andfor keeping it lighted until the next selector in the series responds.

In combination, a series of railway signals, apparatus for each signalincluding a code key operated bythe signal for transi mitting adistinctive impulse combination, a series of selectors located at acentral. point and responding to said distinctive impulse combinationsrespectively, indication devices associated with said selectors, and

means for operating each device upon the response ofthe associatedselector and for continuing the operation of such device until theresponse of the next selector in the series.

36. In combination, a series of railway slgnals, apparatus for eachsignal including a code key operated by the signal for trans mitting adistinctive impulse combination, a series of selectors located at acentral point and responding to said distinctive impulse combinationsrespectively, and means under the control of an operator at said centralpoint for connecting the transmitting apparatus of any one or more ofsaid signals with said selectors.

37. In combination, a series of railway sig nals, apparatus for eachsignal including a code key operated by the signal for transmitting adistinctive impulse combination, a series of selectors located at acentral point and responding to said distinctive impulse combinationsrespectively, and means comprising code keys at said central point andselectors at said signals for connecting the transmitting apparatus ofany one or more of the signals with said first-mentioned selectors.

38. In combination, a series of railway signals, a dcspatchcfs ollice atransmission line extending from said cc to said signals, a selectoratq'ach signal connected with said transmission linc means in saidolllce tor impressing impulse combinations on said line and including acode key corresponding to each signal selector, a relay at each signal,means tor closing eaclrrelay when the corresponding selector responds toits impulse combination and for subsequently keeping the relay closeduntil the associated signal moves to the stop position, means for eachsignal including a code key operated by the signal for impre sing adistinctive impulse combination on said line when the associated relayis closed, selectors in said, o'lfice connected withsaid line andindividually responsive to the impulse combinations transmitted fromsaid signals, and indicating means in said olhce controlled by saidollice selectors.

39. In combination. a series ot-railway signals a despatchers ollice. atransmission line extending from said ollice to said sig nals, aselector at each signal connected with said transmission line, means insaid ollice tor impressing impulse combinations on said line andincluding a code key corresponding to each signal selector. a relay ateach signal, means for closing each relay when the correspondingselector responds to its impulse con'ibination and for subsequentlykeeping the relay closed until the associated signal moves to the stopposition, a second selector at each signal and also connected with saidline,v additional code keys in said ollice corresponding to said secondsignal selector, and means associated with each signal for placing thesignal at stop when the first and second associated selectors areoperated in sequence by their respective combinations.

40. In combination. a rail ay trallic controlling device, a transmissionline. appa ratus associated with said device for impressing an impulsecombination on said line, and means for disconnecting said apparatusfrom said line it the apparatus should stick in such conditions as toform an electrical connection across he line.

ll. Incombination. a railway trafiie controlling? device, a transmissionline. apparatus associated with said device tor impressing an impulsecombination on said line, and means including a thermal circuitcontroller for disconnecting said apparatus from said line if theapparatus should stick in such condition as toliorm an electricalconnection across the line.

4-2. In combination. a railway trallic conlrolling device. atransmission line. appz1- ratus associated with said novice forimpressing an iiupulsc combination on said line. a relay for connectingsaid apparatus with said line when the relay is energized, and

means for de-energizing said relay it the apparatus should stick in suchcondition as to forman electrical connection across the line.

43. In combination, a railway traflic corn trolling device. atransmission line, apparatus associated with said device for impress ingan impulse combination on said line, said apparatus including a sourceof current and an intermittently closing contact, a relay arranged whenenergized to connect said opparatus with said line, a circuit for saidrelay including a normally closed contact of a thermal circuitcontroller,.and a circuit for the winding of said circuit controllerinclud ing a second intermittentlyclosing contact operated in unisonwith the first contact.

44. In combination, a" railway trallic controlling device. atransmission line, appa-' ratus associated with said device forimpressing an impulse combination on said line, said apparatus includinga source of current and an intermittently closing contact, a relayarranged when energized to connect said apparatus with said line, andmeans inclbding a second intermittently closing contact operating inunison with the first said contact for (lo-energizing said relay it saidcontacts remain closed for more than a given length of time.

45. In combination, a railway trallic controlling device. a transmissionline. apparatus associated with said device for impressing an impulsecombination on said line, said apparatus iucluding'a source of currentand an intermittently closing contact. and means associated with saidapparatus for disconnecting the apparatus from said line it said contactremains closed for more than a given length of time.

46. In combination, a railway signal. a selector having a normally opencontact which b comes closed when the selector receives the impulsecombination to 'ivhich it responds, and remains closed until theselector subsequently receives an impulse, a stick relay. meansincluding said selector contact for closing said stick relay, means forsubsequently keeping said relay closed until said signal changes to thestopindi; cation, and means controlled by said relay and by saidselector contact for giving an indication at a distant poiut if saidsignal indicates proceed.

47. In combination. arailway signal a selector having a normally opencontact which becomes closed when the selector receives the impulsecombination to which it responds. and remains closed until the selectorsubsequently receives an impulse. a stick relay. means including saidselcctor contact for closing said stick relay, means controlled by saidsignal for subsequently keeping said rclay closed. and means con trolledby said relay and by said selector contact for giving an indication at adistant point of the condition of said signal.

48. In combination, a railway signal, a selector having a normally opencontact which'becomes closed when the elector receives the impulsecombination to which it responds, and remains closed until' the selectorsubsequently receives an impulse, a stick relay, means including saidselector contact for closing said stick relay, means controlled by saidsignal for subsequently keeping said relay closed, and indicationapparatus controlled by said relay and said signal and said selectorcontact.

49. In combination, a railway signal, a selector having a normally opencontact which becomes closed when the selector receives the impulsecombination to which it responds, and remains closed until the selectorsubsequently receives an impulse, a stick relay, means including saidselector contact for closing said stick relay, means for subsequentlykeeping said relay closed until said signal changes to the stopindication, means operating when said relay and said selector contactare closed to ive an indication at a distant point while said signal isgiving a proeeedjnrlication, and means controlled by said relay forgiving an indication at said distant point when said signal changes tostop.

50. In combination, a transmission line, a plurality of selectorsconnected with said line and responsive to diiferent impulseccmbinations, each selector including a normally open contact which isclosed when the selector receives the impulse combination to which itresponds, and remains closed until another impulse is impressed on saidline, railway signals, and indication means for said signals controlledby said select-or contacts.

51. In combination, a transmission line, a plurality of selectorsconnected with said line and responsive to diflerentimpulsecombinations, each selector including a normally open contact' which isclosed when the selector receives the impulse combination to which itresponds, and remains closed until another impulse is impressed on saidline, railway signals, a stick relay for each selector, means for'eachstick relay including the contact of the associated selector for closingthe relay, holding circuits for said relays controlled by said signals,indication means for said signals controlled jointly by said relays andsaid selector contacts, and other indication means for said signalscontrolled by said relays but not by said selector contacts.

52. In combination, a railway signal, a selector having a normally opencontact which becomes closed when thc selector rcceives the impulsecombination to which it responds, and remains closel until the selectorsubsequently receives an impulse, a stick relay, means including saidselector contact for closing said stick relay, means controlled by saidsignal for subsequently keeping said relay closed, indication appa- Tratus for said signal controlled jointly by said relay and said selectorcontact, and other indication apparatus for said signal controlled bysaid relay but not by said selector contact.

53. In combination, a railway signal, a dcspatchers station, atransmission line extending from said signal to said station, a selectorat the signal having its operating winding connected with said line,said selcctor having an auxiliary Winding in inductive relative to saidoperating winding, means at said station for impressing on said line theimpulse combination to which said selector responds; a circuit includingsaid auxiliary winding, the selector contact, means for supplyingperiodic current, and a contact controlled by said signal; and atelephone receiver connected with said line at the despntchers station.

54. In combination, a transmission line, a selector having its operatingwinding connected with said line and-having an auxili ary Winding ininductive relation to said operating winding, means for impressing onsaid line the impulse combination to which said selector responds, acircuit including said auxiliary winding and controlled by the selectorcontact, means for supplying a periodic current to said circuit, arailway lrallic controlling device for controlling said. circuit, and areceiving device connected with said line for detecting the alternatingcurrent impressed on the line by said operating wiudingduc to periodiccurrent in Said auxiliary winding.

55. in combination, a transmission line, a scllu'ior' having itsoperating Winding cennectcd with said line and havin an auxiliarywinding in inductive relation to said operating winding, means forimpressing on said line the impulse combination to which said selectorresponds, a circuit controlled by the contact of said selector andincluding said auxiliary Winding means for supplying periodic currenttosaid circuit,

ill?) a railway signal, a contact operated by said signal forconlrollin; said circuit, and a rewiring device conneclcd with said linefor dorm-ling the alternating current impressed on the line by saidoperatingwinding due (0 periodic current in said auxiliary winding.

In combination, a transmission line, a selector having its operatingWinding connected with said line and having an auxiliary winding'ininductive relation to said operating, winding, means,- for imprcsslng onsaid line the impulse combination to which said selector responds, arailway signee'eeeo nal, and means controlled by the contact of saidselector and including the two windings thereon-for giving an indicationat. a

distant point through said transmission line oi the condition of saidsignal.

57. in combination, railway signal, it selector having e normally opencontact which becomes closed when the selector roceives the impulsecombination to which it responds, said selector also having anziuxiliary winding in inductive relation to its operating winding, andindication apparatus assocated with said signal and including saidauxiliary winding.

58. In combination, a transmission line, two selectors having theiroperating windings connected with said line and responsive to(litl'erent impulse combinations and each having an auxiliary winding ininductive ELE- relat-ion to its operating Winding, means for impressingon said line the impulse combina tions to which said selectors respond,e cir cuit for thenuXilia-ry winding of each selector and controlled bythe contact of the some selector, means for supplying periodic currentto each of said circuits, a railway signal, means controlled by saidsignal for closing one of said circuits or the other eecording as saidsignal gives one indication or another, and a receiving device connectedwith said line for detecting the alternating current impressed on theline by the opernting windings of said selectors due to the periodiccurrent 111 said auxiliary windings. In test mony whereof We efiixours1gnetures,

DANIEL W. RICHARDS. HARRY P. HANCOCK,

